| Beringia |
| Beringia is a landmass including portions of 3 modern nations (Canada, US and Russia) and extending from the Siberian Kolyma River and Kamchatka Peninsula, through Alaska and Yukon Territory, to the Mackenzie River... |
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| Champlain Sea |
| The Champlain Sea is a body of saline to brackish water 55 000 km2 that occupied the depressed land of the ST LAWRENCE LOWLAND between Québec City and Brockville, Ont, and extended up the Ottawa River... |
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| Earthquake |
| Earthquake, vibratory motion generated in the Earth by the rupture of subterranean rock subjected to elastic stresses greater than its breaking strength. The rupture gives rise to seismic waves which propagate... |
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| Fossil |
| Fossil [Lat fossilis, "dug up"], trace of an ancient animal or plant preserved in the Earth's crust. PALAEONTOLOGY is the modern, scientific study of fossils, but these curious objects have attracted... |
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| Geological Dating |
| For centuries people have argued about the age of the Earth; only recently has it been possible to come close to achieving reliable estimates. In the 19th century some geologists realized that the vast thicknesses... |